Synthesis and characterisation through diffraction techniques of two stable cubic MAPbI3 photovoltaic perovskite phases

The study aims primarily to explore synthetic routes and chemical manipulation of perovskite materials and characterise these materials through diffraction techniques. This thesis presents the discovery of a new hybrid perovskite structural phase, derived from the prototypical MAPbI3 perovskite, which demonstrates room temperature ordering of the methyl ammonium cation and the presence of interstitial iodine sites through the addition of iodide vapour. Additionally, this thesis presents a stable tetragonal-cubic chemical phase transition in the MAPbI3 perovskite when synthesised using high temperature vacuum assisted annealing.